Question

Which of the following correctly demonstrates the Associative Property of Addition?(1 point)
Responses

m⋅(x⋅y)=(m⋅x)⋅y

m times left parenthesis x times y right parenthesis equals left parenthesis m times x right parenthesis times y

x⋅(y+z)=(x⋅y)+z

x times left parenthesis y plus z right parenthesis equals left parenthesis x times y right parenthesis plus z

y−(x+1)=(y−x)+1

y minus left parenthesis x plus 1 right parenthesis equals left parenthesis y minus x right parenthesis plus 1

(x+y)+z+r=x+(y+z)+r

Answer 1

(x+y)+z+r = x+(y+z)+r

This shows re-grouping of addition (i.e. (a+b)+c = a+(b+c)), which is the associative property of addition.